To Turn Off Appliance; Adjusting The Water Temperature - Bosch 520-HN -L Manual

22 | Operation instructions
▶ The gas valve must be shut off by putting the ON/OFF
switch to position OFF
out any gas. If you smell gas, STOP! Follow "B" in chapter
4.1. If you do not smell gas, go to the next step.
Fig. 17
▶ This water heater is equipped with a safety pilot burner and
an automatic ignition control system.
▶ Set the ON/OFF button to the position ON
position, the water heater is ready to use.
▶ Open hot water tap to a flow rate above the minimum
activation rates listed in table 4. The automatic ignition
system first ignites the safety pilot burner which then
ignites the main burner in about 4 seconds.
▶ The green LED indicator is on when the main burner is on.
▶ The pilot flame will extinguish a few seconds after the
burners come on. The burners will remain on until the hot
water tap is turned off.
Note: The 520 HN operates in two modes. See SETTING
THE WATER TEMPERATURE.
Note: On initial installation, existence of air
in the gas supply line and in the water line
may cause some ignition delay. In that case,
repeat the ignition process until all the air
has been purged.
5.3

To turn off appliance

▶ Set the ON/OFF switch to the position OFF
6 720 644 942 (2014/11)
Wait five (5) minutes to clear
In this
.
Fig. 18
▶ Close installer supplied manual gas shutoff valve on the
supply line to the heater.
5.4

Adjusting the water temperature

The 520 HN has two knobs that regulate temperature. One
knob controls temperature by regulating water flow through
the heater. The other knob controls temperature by adjusting
the gas supply to the burners.
1
Fig. 19
[1] Power adjustment knob
[2] Flow control knob
Flow control knob
The flow control knob (see Fig. 20 & Fig. 21) adjusts
temperature by adjusting flow capacity. See table 4 for details.
2
6720608036-08.1Av
520 HN